Sulfonamido substituted acetal polymers and use thereof in photo-sensitive compositions and lithographic printing plates

- Sun Chemical Corporation

The present invention relates to binders and photosensitive compositions comprising said binders. The binder comprises units A, B, C and D, wherein A is present in an amount of 0.5 to 15 wt. % and is of the formula ##STR1## B is present in an amount of 10 to 35 wt. % and is of the formula ##STR2## C is present in an amount of 10 to 50 wt. % and is of the formula ##STR3## wherein R.sup.1 is methyl, ethyl, propyl or isopropyl, and D is present in an amount of 25 to 70 wt. % and is of the formula ##STR4## wherein n is an integer of from 1 to 3 andR.sup.2, R.sup.3 are hydrogen or methyl andR.sup.4 is alkyl, aralkyl or aryl.

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Claims

1. A photosensitive composition comprising:

(i) a diazonium polycondensation product or
a free radical polymerizable system consisting of photoinitiators and free radical polymerizable components or
a hybrid system consisting of a diazonium polycondensation product and a free radical polymerizable system consisting of photoinitiators and free radical polymerizable components, and
(ii) a binder
containing the units A, B, C and D, wherein A is present in an amount of 0.5 to 15 wt. % and is of the formula ##STR9## B is present in an amount of 10 to 35 wt. % and is of the formula ##STR10## C is present in an amount of 10 to 50 wt. % and is of the formula ##STR11## wherein R.sup.1 is methyl, ethyl, propyl or isopropyl, and D is present in an amount of 25 to 70 wt. % and is of the formula ##STR12## wherein n is an integer of from 1 to 3 and R.sup.2, R.sup.3 are hydrogen or methyl, and R.sup.4 is alkyl, alkyl or aryl.

2. The composition of claim 1, wherein the photosensitive component is a polycondensation product of 3-methoxy-diphenylamine-4-diazonium sulfate and 4,4'-bis-methoxymethyldiphenyl ether precipitated from aqueous solution as organic sulfonate, tetrafluoroborate, hexafluorophosphate, hexafluoroantimonate or hexafluoroarsenate.

3. The composition of claim 1, wherein the photosensitive component is a radical-forming photoinitiator or mixtures of photoinitiators and coinitiators rendering the mixture sensitive to the wavelengths from 300 to 800 nm as well as radically polymerizable components with unsaturated groups.

4. The composition of claim 1 further comprising an--exposure indicator,--a--dye for increasing the contrast of the image as well as--an--acid for stabilizing the photosensitive composition.

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Patent History
Patent number: 5698360
Type: Grant
Filed: Jul 10, 1996
Date of Patent: Dec 16, 1997
Assignee: Sun Chemical Corporation (Fort Lee, NJ)
Inventors: Hans-Joachim Timpe (Osterode), Udo Dwars (Herzberg), Harald Baumann (Osterode), Celin Savariar-Hauck (Badenhausen)
Primary Examiner: John S. Chu
Attorney: Sidney Persley
Application Number: 8/677,703
Classifications
Current U.S. Class: Polymeric Diazonium Compound (430/175); Diazonium Compound Containing Layer (430/157); Polymeric Mixture (430/176); 430/2811; Lithographic (430/302)
International Classification: G03F 7021;